2005년 IETF에서는 2계층 장치인 이더넷과 3계층 IP 라우터의 장점을 접목시켜서 두 계층의 특징을 하나의 장치에 융합한 L2.5 개념의 스위칭 표준을 제정하는 2개의 웍그룹 활동이 개시되었다. 하나는 GMPLS 프로토콜을 연구하는 CCAMP 웍그룹에서 기존의 활동 영역을 이더넷 분야로 확장하는 시도이고 또 다른 하나는 IS-IS 라우팅 프로토콜의 개발자로 유명한 라디아 펄먼이 주도하는 TRILL이라는 신생 웍그룹이다. 전자는 코어망에서 잘 발달된 GMPLS 제어 프로토콜을 이더넷의 단순 브리지 프로토콜 대신 적용함으로 이더넷 브리지가 MPLS 라우터의 특징을 가지도록 하는 시도인 반면, 후자는 Rbridge라는 새로운 라우팅 브리지 구조를 정의하여 IS-IS 라우팅의 특징을 접목시키려 하고 있다. 본 고에서는 IETF에서 시도하고 있는 이들 신 개념의 이더넷 브리지 표준화 동향에 대해 소개한다.
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